THE STREPTOTHRICOSES 573 
disease, its beginning in the jaw in most cases and the 
prominence of pulmonary and gastric lesions, all seem 
to support the thought that the virus is received with the 
fodder or drink. The anatomy of the kangaroo's buccal 
cavity favors the collection of material between the gums 
and cheeks and between the root of the tongue and the 
molars, while the " hare lip " also affords a crevice in 
which food particles or foreign bodies may accumulate. 
These three places seem to be the starting points of 
most of the cases. 
The Course of the Attack. 
Despite careful watching of the exhibition specimens 
it is often difficult to detect the beginning stages of the 
disease. Since our last outbreak it has been the practice 
to examine all kangaroos thrice yearly by catching them, 
inspecting the buccal membranes, teeth, tongue and nose 
and by palpating the jugular and sublingual regions. This 
procedure succeeded in catching one very early case from 
which the original changes can be described. 
The animal appeared in generally good condition but 
close inspection revealed a '' running nose," a purplish 
mottling along the gingival margin of one lower jaw be- 
low which was a doughy swelling ; no internal ulceration 
had appeared nor was there a \dsible change in the exter- 
nal contour of the jaw. Within a few days a small fusi- 
form lump appeared along the body of the lower maxilla 
which spread gradually backward, the nearby soft parts 
becoming involved very shortly. This particular animal 
died without ulceration but with evidences of septicemia. 
Usually at the time that the lump is noticeable the animal 
loses appetite, becomes inactive and seems depressed ; no 
especial change in the coat need be perceptible although 
it may be lusterless or at times ruffled. In the cases mth 
gTeat involvement of the cervical tissues, dyspnoea is an 
early sign but I lay this more to pulmonary disease than 
to mechanical obstruction of the upper air passages. The 
